Ebeko , Kamchatka :

50.69 N, 156.01 E;

Elevation 3792 ft (1156 m)
Aviation Colour Code is ORANGE

A moderate gas-steam with some amount of ash activity of the volcano continues. Ash explosions up to 16,400 ft (5 km) a.s.l. could occur at any time. Ongoing activity could affect low-flying aircraft and airport of Severo-Kurilsk.

A moderate explosive activity of the volcano continues. According to visual data by volcanologists from Severo-Kurilsk, explosions sent ash up to 2.4 km a.s.l. on 05-08 February; ashfalls were noting at Severo-Kurilsk on 08 February. Satellite data by KVERT showed the volcano was quiet or obscured by clouds.

Source : Kvert

Photo : Olga Tuma

Mayon , Philippines :

MAYON VOLCANO BULLETIN 12 February 2018 08:00 A.M.

Mayon’s activity in the past 24 hours was characterized by sporadic and weak lava fountaining, lava flow and degassing from the summit crater. Discrete episodes of lava fountaining lasted four (4) to twenty (20) minutes. Incandescent lava fountains 150 meters tall generated steam-laden plumes that rose up to 400 meters from the summit before drifting northwest and west northwest. Throughout the night, lava flows and consequent incandescent rockfalls were observed in the Miisi and Bonga-Buyuan channels. Effused volumes of incandescent lava flows have advanced to 3.3 kilometers, 4.5 kilometers and 900 meters down the Miisi, Bonga and Basud Gullies, respectively, from the summit crater. Pyroclastic density currents or PDCs have deposited to the 4.6, 4.5 and 4.2 kilometer reaches of the Miisi, Bonga and Basud Gullies, respectively.

A total of ninety-two (92) volcanic earthquakes, most of which corresponded to lava fountaining events were recorded by Mayon’s seismic monitoring network. Electronic tilt and continuous GPS still record sustained swelling or inflation of the edifice since November and October 2017, consistent with pressurization by magmatic intrusion.

Alert Level 4 remains in effect over Mayon Volcano. The public is strongly advised to be vigilant and desist from entering the eight (8) kilometer-radius danger zone, and to be additionally vigilant against pyroclastic density currents, lahars and sediment-laden stream flows along channels draining the edifice. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden eruption can be hazardous to aircraft. DOST-PHIVOLCS maintains close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.

Activity:
Presence of white, moderate, degassing fumaroles at a height of 600 m, which are scattered to the southwest. Strombolian explosions are recorded which project incandescent materials 5 to 30 m high around the crater. The lava flow is about 150 m long and runs west and southwest. No sound is recorded.

Source :Insivumeh.

Sinabung , Indonesia :

Level IV Activity Level (AWAS). The Sinabung (2460 m altitude) has been erupting constantly since 2013. Since yesterday until this morning was often covered with fog. The smoke rising from the crater has not been observed. The wind is blowing moderately to the south. There were 3 eruptions with an altitude of 1000 to 1500 m above the summit and 10 avalanche events with a sliding distance of 500 m to the east and south-east.

Recommendations:
Communities / visitors should not do activities within 3 km of the summit, and by sector, 7 km to the South-South-East, 6 km East-South-East and 4 km to the South-East. km northeast.
The deposits formed a dam upstream on the Laborus River. People living in downstream river basins and around the Laborus River need to be vigilant because these dams can collapse at any time and no longer retain water volume, resulting in downstream lahars / floods .

San Cristobal , Nicaragua :

February 04 , 2018.

The highest volcano in Nicaragua, San Cristobal, returned to normal activity after showing an increase in its seismic tremor, which led the authorities to warn of a possible explosion of gas and ash, reported today. the Nicaraguan Institute of Territorial Studies (Ineter).
The San Cristobal, 1,745 meters above sea level, has seen hundreds of « microseisms » since last January and Saturday, its tremor has increased, the authorities have warned of a possible explosion of gas and ash.

However, the Ineter reported Sunday, a decrease in seismic tremor, which is the telluric movement originating from a volcano following the agitation of magma or water.
It had been reported 110 earthquakes on the volcano.
Ineter also reported the real-time seismic amplitude reduction (RSAM), which measures the movements of the crater’s internal walls.